Boiler



E. RouKA Dec. 8, 1931.

BOILER Filed April 8, 195 0 fm TOR BY ATTORNEY'S Patented Dec. 1931 UNITED STATES PATENT OFFICE mama aoucxa, or nmmsxo, czacnosnovnm aoumt Application fled April 8, mo, s mi K0. 44am, and in Czechoslovakia April 10, 1020.

This invention relates in general to hot water or steam boilers, one ob ect of the invention bein to provide a novel and improved construction, combination and arrangement a of a plurality of furnaces and the heating surfaces of the boiler, whereby complete combustion of combustible ses and vapors is pbtrained and heat there rom efiiciently utiize Another object is to provide a boiler of the general character described including a fire box havin a primary furnace. disposed over a grate, or exam 1e a traveling or chain grate, and a secon ary furnace arranged in superposed relation to the rimary furnace, with the main heating sur ace of the boiler located at one side of said furnaces and congected to the secondary furnace by a-smoke' Other objects are to provide a boiler of this character in which the main fire box is divided substantially horizontally by an inclined wall or partition into a primary furnace and a secondary furnace which are ar- I ran 'ed in superposed relation with heatin sur aces, such as fire tubes or fines, arrange at one side of said furnaces and connected by a smoke box to the seconda to obtain other advanta es an results as will I be-brought out b the ollowing description.

Referring to t e accompanying drawings in which corres onding parts are designated by the same re erence characters throughout the several wiews. Figure 1 is a perspective view of a boiler embodying my invention showing portions broken away and illustrated in. section.

Figure 2 is a similar view looking at the boiler from the opposite end, the door being removed, and

Figure 3 is a schematic-transverse sectional view illustrating the manner of constructing the boiler in' sections for convenience in.

transportation.

,S cifically describing the illustrated embodmi'ent of theinvention, the boiler is shown as including a casing 1 having at one side adjacent the bottom. thereof a chain-grate mechanism 4 to which fuel, such as coal,'is {i0 fed by a hopper 2 in the usual manner to I furnace, and

- The combustion gases thereby turn through the smoke box 13 into the fire tubes 12 andform a fuel bed 3. 'Beneath the chain grate mechanism 4 is arranged the usual ash pit (not shown), and the usual ash pit damper 5 is provided for producing a draft. Above the chain grate mechanism is a fire box 6 which is divided substantially horizontally by an inclined wall-7 into a prmiary furnace 8 below the wall, and a secondar furnace'9, above the wall. This wall exten upwardly from the end of the fire box 6 o posite the 00 hopper 2 toward the hop rfor uel supply end of the fire box an terminates short thereof; and the wall 7 preferably is formed of blocks of refractor material. At the end of said inclined wa 7 opposite the fuel .5 supply hopper 2 is arranged a smoke box 10 ghici is orizontally wider than the fire x 1 With this construction, it will be observed that one side of the smoke box '10 'comfmini- I0 I cates with the secondary furnace 9 so that the combustion gases from the fuel bed 3 rise upwardly from the fuel bed beneath the inc ined wall 7 toward the fuel suppl end of the fire box 6, then upwardly aroun the end II of the wall 7 and rearwardly' through the sec* ondary furnace 9 into the smoke box 10. At

one SldQ of the fire box 6 are arranged the main heating surfaces of the boiler which in the present instance are shown as compris- I! ing two banks 11 and 12 of horizontal flues 'or fire tubes of known construction. The flues of theba'nk v11 are connected at one end to the smoke-box 10 and at the other end to Y a second smoke box 13. The second bank of fire tubes 12 have one end connected to the smoke box 13 and the other ends connected to a second smoke box 14, which is'in turn connected to a chimney or stack (not'shown).

the smoke box 10 from the secondary furnace 9 into the bank 11 of fire tubes, horizontally 'at an angle of degrees. From the fire tubes 11 the gases of combustion pass through thenceto the chimney or stack. Surrounding the fire box and thefire tubes 11 and 12 is' the usual water chamber 15 through which the fire tubes pass in the'usualmanner'., 'm

Preferably the secondary furnace 9. has its walls lined with refractory material such as fire brick 16 to produce a high temperature so as to cause complete-combustion of all combustible gases and vapors.

Also, the outer end of the smoke-box 10 is preferably in the form of a door or closure 17' hinged at 170 and having a water chamher which may be connected to the chamber shown in Figure 3 of the drawings with the portions of the water chamber connected together by any suitable means such as known fittings D and E. The section A may comprise the main fire box and a part of the smoke box 10, while the other section may include the fire tubes 11 and 12 and the remainder of the smoke-box. In other words,

the boiler may be divided at the fire box side of the wall 20 which separates the main fire box 6 and the water chamber.

With this construction it will be observed that the primary combustion takes place in the primary furnace 8, the gases of combustion passing along the underside of the wall 7 and then upwardly around the end of the wall into the secondary furnace 9 where complete combustion of the combustible gases and vapors takes place. The gases then pass from the secondary furnace into the smokebox 10 and through the fire tubes 11 and 12 to the stack. The heat from the combustion is thereby efiiciently utilized in heating the water in the water chamber 15.

While I have shown and described'my invention as embodied in certain details of construction, it should be understood that this is primarily for the purpose of illustrating the principles of the invention and that many modifications and changes may. be made in the details of construction without departing from the spirit orscope of the invention.

Having thus described my invention, what I claim is A boiler comprising a casing having a main fire box at one side thereof, said fire box having a grate therein and a fuel supply opening main fire box, a water chamber, fire tubes through said water chamber at one side of said main fire box and communicating at one end with said smoke box, a second smoke box at the first-mentioned end of said casing communicating with the other ends of said fire tubes, and additional fire tubes through said water chamber connected at one end to said second smoke box and with their other ends to be connected to a flue or chimney, whereby the gases of combustion pass from said primary furnace through said secondary furnace into said smoke box, then turn horizontally 180 degrees into the first-mentioned fire tubes and thence through said sec ond smoke box and the second-mentioned fire tubes. l

ERIGH ROUCKA.

at one end thereof, an inclined wall above said grate extending upwardly from the otherend I of the fire box toward and terminating short fbox into a' primary furnace between said of saidfuel supply end and dividing said fire grateand said wall and a secondary furnace above said wall, a smoke-box at the end of said secondary furnace communicating therewith and extending transversely of the casing toward the other side thereof beyond said 

